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Updated: Jul 29, 2025

Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples
Published on: October 18, 2019
Functional Characterization of the Putative POT from Clostridium perfringens
Hani Gharabli1, Maria Rafiq1, Anna Iqbal1
1Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
This study reveals atypical transport mechanisms in Clostridium perfringens proton-coupled oligopeptide transporters (CPEPOT). Unlike other bacterial POTs, CPEPOT exhibits substrate exchange, not proton symport, for peptide uptake.
Area of Science:
- Biochemistry
- Molecular Biology
- Microbiology
Background:
- Proton-coupled oligopeptide transporters (POTs) are crucial for nutrient uptake in various organisms.
- Mammalian POTs are significant for drug delivery due to their ability to transport peptidomimetics.
Purpose of the Study:
- To investigate the transport characteristics of a POT from Clostridium perfringens (CPEPOT).
- To understand the atypical transport mechanisms of CPEPOT compared to other bacterial POTs.
Main Methods:
- Studied the uptake of a fluorescently labeled peptide (β-Ala-Lys-AMCA) using CPEPOT.
- Investigated the effect of competitor peptides and proton electrochemical gradients on peptide uptake.
Main Results:
- CPEPOT showed very low uptake of the standard peptide substrate β-Ala-Lys-AMCA.
- Observed trans-stimulation of β-Ala-Lys-AMCA uptake in the presence of competitor peptides.
- This trans-stimulation occurred independently of the proton electrochemical gradient.
Conclusions:
- CPEPOT functions via a substrate-concentration-driven exchange mechanism, not proton symport.
- This represents a novel transport mechanism for bacterial POTs, distinct from previously characterized systems.
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